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You have carried out a first-hand investigation to compare the reactivity of an alkene with its corresponding alkane - HSC - SSCE Chemistry - Question 16 - 2002 - Paper 1
Question 16
You have carried out a first-hand investigation to compare the reactivity of an alkene with its corresponding alkane. (a) State the name of the alkene. (b) Outline... show full transcript
Worked Solution & Example Answer:You have carried out a first-hand investigation to compare the reactivity of an alkene with its corresponding alkane - HSC - SSCE Chemistry - Question 16 - 2002 - Paper 1
Step 1
Step 2
Outline a procedure to compare the reactivity of this alkene with its corresponding alkane.
Answer
- Prepare a test tube containing a small amount of bromine water.
- In separate test tubes, add an equal volume of both the alkene (ethene) and the corresponding alkane (ethane).
- Add bromine water to both test tubes and observe any color change.
- Record the time taken for any color change to occur, which indicates the degree of reactivity.
- Repeat the experiment at least twice for accuracy.
Step 3
Describe the results obtained from this first-hand investigation and include relevant chemical equations.
Answer
The results showed that the alkene (ethene) reacted more quickly with bromine water than the corresponding alkane (ethane). The color change in the test tube with ethene was immediate, indicating a reaction, while the alkane showed little to no change after a longer period. The chemical reaction for the alkene is:
ightarrow ext{C}_2 ext{H}_4 ext{Br}_2$$ For the alkane (ethane), no significant reaction is expected, as follows: $$ ext{C}_2 ext{H}_6 + ext{Br}_2 ext{ (no reaction under normal conditions)}$$